diff --git a/requirements.txt b/requirements.txt
index 79b9ba7..35c9726 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,7 +30,7 @@ six==1.12.0
 transaction==2.4.0
 translationstring==1.3
 ujson==1.35
-urllib3==1.25.3
+urllib3==1.25.5
 venusian==1.2.0
 waitress==1.3.1
 WebOb==1.8.5